If your wife just paid for 4.9.37 Pro then I'd suggest she was scammed...when people buy Pro from the official site Lime Wire » Official Website & Free Download, BitTorrent « they download the latest version of LW Pro. The latest stable release is 4.14.12.
4.9.37 was released in November, 2005. There are no old installers available for windows users to download from the official site.

Try to find out who she paid for LW (she might've recieved a confirmation email/receipt). Contact your bank/CC company & report this, they may be able to stop payment.

Membership? - **BEWARE** - Download p2p Clients ONLY Thru Official Sites (click on link)

get your $$$ BACK!!! (music members)

Just FYI, the official site has a no refund policy for Pro...because the basic version is free to use for as long as you like.
Frequently Asked Questions - LimeWire

I'd suggest you uninstall the old Pro (start > all programs > Limewire > use the uninstall option), just in case the app is corrupted or has some malware attached. Then use your computer's search to look for all files & folders with limewire in the name, delete what you find. Restart your computer & then download & install the latest free LW from the official site.

Try replacing the gnutella.net file again in the new version, if it doesn't connect. Remember that LW must be completely closed before deleting the preferences folder or replacing the gnutella.net file...otherwise it's a waste of time.

If you're sure that you've done those steps correctly & there's still no connection, try port forwarding for your router. The instructions are here.
Port Forwarding for the Netgear WPN824v2
Don't forget to set up a static IP address first. LW's listening port, port number in the 'manual port forward' box & port number forwarded within the router setup should all be the same number.